Miller told his players that fisticuffs could backfire against a NSW side needing victory to enhance its semi-final chances.

"Matt Burke is a world-class goalkicker and while he missed the (last-minute) kick (in the loss to the Highlanders) last week, he certainly can hurt us if we give away penalties in our own half," he said.

"And we can't afford to lose anybody for 10 minutes in the sin-bin. For me, it's a fine line between getting the emotion to the right level because if we get too carried away, we can either play the game before we get out there or suffer stage fright."

Miller was concerned a record crowd at the renamed Lang Park, renowned for hosting fire and brimstone rugby league State of Origin battles, would have an adverse effect if the Reds weren't totally composed.

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It is the first interstate rugby union clash at the upgraded 52,000-seat-capacity stadium.

NSW must reverse its winless Super 12 record against the Reds to stay in play-off contention.

Brumbies coach David Nucifora yesterday warned the Chiefs they risked missing a maiden Super 12 finals berth by altering their game plan to achieve it with a four-try performance.

The third-placed Chiefs (32) need only one more point to cement a top-four spot and have indicated they will chase it with attacking rugby against the ACT at Waikato Stadium tomorrow.

The table-topping Brumbies (36) are also desperate for a point of their own to guarantee a semi-final at their Canberra home, where they are unbeaten this year.